Physical properties of Tabriz gray marlstone, NW of Iran

Abstract

Tabriz is one of the largest cities in Iran, with a population of more than 2 million. Marlstone is the bedrock of most areas of the city. These marls, consisting of lime and clay, are found in different colors such as yellow, olive, and gray, which mostly belong to Baghmishe and Upper Red Formations. These marls have different amounts of organic materials and in high percentages cause the formation of lignite. The physical characteristics of the marl are different and the gray marl has a high density and strength. Another important characteristic of marls is the high rate of weathering which in excavations, changes over several months and turns into soil. Therefore, marl is considered both a weak rock and a hard soil. This study, by sampling and conducting experiments, presents the physical and mechanical characteristics of gray marls in different parts of Tabriz city. The carbonate content of the mentioned marls is between 30 and 60% and their dry unit weight is between 17.5 and 20.0 kN/m3. The clay minerals in these marls also include illite, montmorillonite, etc. © 2023 selection and editorial matter, Askar Zhussupbekov, Assel Sarsembayeva & Victor N. Kaliakin; individual chapters, the contributors.